Dismantle the dashboard
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If the fuel gauge changes with the revs of the engine, fails to read
full when the fuel tank is full or becomes generally unreliable, the
voltage stabiliser that sits behind it may have started to fail. This
helps to maintain a steady voltage supply to the fuel gauge to avoid
fluctuations in the fuel level reading. It can be replaced by removing
the instrument binnacle. Disconnect the battery, then detach the
ends of the heater stalks, undo any securing screws before pulling the
binnacle forwards and unscrewing the speedo cable from the back of
the speedo. Pull the binnacle forwards a little to access the back of it.
Replace the voltage stabiliser
(pictures 4-6)Locate the voltage stabiliser on the back of the fuel gauge. Note
which wires are connected to it and label them if it helps to
remember. Look for a small securing screw that locates the voltage
stabiliser and carefully undo it. Remove the old voltage stabiliser
and replace it, ensuring the new one is the correct type and has the
appropriate terminals. Refit the small securing screw, reconnect
the wires, then reassemble the dashboard. Reconnect the battery
and switch on the ignition to check the fuel gauge is working. When
convenient, fill the fuel tank to check the accuracy of the fuel gauge.1
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